INFORMIX SERVER / 5725A3900 / C10 - IDS 12.10

In the LowMemoryManager function, LowMemoryReconfig, we
calculate shm values
in order to activate actions when specific memory conditions are
met. Unfortunately
we use the wrong value for SHMTOTAL in these calculations.

The function is defined as


    IF stop_threshold < start_threshold THEN
       LET stop_threshold = start_threshold * 2 ;
    END IF

   SELECT cf_effective
        INTO sh_total
        FROM sysmaster:sysconfig
        WHERE cf_name="SHMTOTAL";

   LET used_limit = sh_total - (stop_threshold * 1024);

   SELECT sum(seg_blkused)*4096
        INTO used_memory
        FROM sysmaster:sysseglst WHERE seg_class != 3;


    IF caller = "LMM" OR used_memory > used_limit  THEN

.....

so we calculate the threshold value for the memory which is in
bytes. We calculate the
used memory in the instance which is finally in bytes. And we
select the value for SMHTOTAL
from sysconfig but this value is in KB!
The if clause for the trigger of activities when the memory is
too low is more or less activated in
each system all the time.

****************************************************************
* USERS AFFECTED:                                              *
* All current users of Informix 12.10.xC8 or older.            *
****************************************************************
* PROBLEM DESCRIPTION:                                         *
* See Error Description                                        *
****************************************************************
* RECOMMENDATION:                                              *
* Upgrade to 12.10.xC9 when available                          *
****************************************************************

not known / see Local fix

Date  - problem reported    :
Date  - problem closed      :
Date  - last modified       :

06.12.2016
10.07.2017
10.07.2017

12.10.xC9